Microthamnium. } 17. STEREODONTE X. 507 
9. M. SELLowir (Hornsch. in Mart. Fl. Bras. Musc. 66, Hookeria). 
Caulis declinatus, inferne simplex, superne subfastigiatim ramosus, ramis 
brevibus complanatis pinnatis. Folia caulina remota, conspersa, patentia 
v. subsquarrosa, serrulata, caviuscula, binervia, ramea disticha ovato- 
lanceolata acuta argute serrata, nervis infra medium dissolutis, omnia 
pallide viridia, e cellulis linearibus laxiusculis areolata ; perichzetialia ovato- 
lanceolata, acuminata, intima in acumen subulatum flexuosum producta, 
hyalina, laxius reticulata. Theca in pedunculo purpureo tortili levi 
longiusculo apice curvato horizontalis, oblonga, zequalis, badia; peristomii 
dentes interiores perforati, lanceolato-subulati, lutescentes, cilis binis 
hyalinis subulatis articulatis interjectis.— C. Müll. Syn. ii. 242 (Hypnum 
argute-serratum). 
Hab. Brasilia, Sellow. 
10. M. Lanesporrrtt (Hook. in Kunth. Syn. Pl. Æq. i. 62, Hypnum). 
Folia caulina inter se remota, patenti-divergentia, serrulata, ramea com- 
pressa, ovato-lanceolata, argutius serrulata, dorso parce papillata, cellulis 
elongatis, nervis brevibus; perichztialia e basi ovata subulata, longe 
attenuata. Theca in pedunculo elongato horizontalis pendulave, turbinata, 
inzqualis, operculo acuminato brevirostro, peristomii interni ciliis quam 
processus brevioribus noduloso-articulatis punctulatis. 
Hab. Fl. Orinoco, Maypures, Swainson. Nova Granata, Weir, n. 421. 
Andes Quitenses, Quito, Jameson; ad cataractas Agoyan (5500 ped.), 
Spruce, n. 1119. Brasilia, Gardener, n. 118; Parana, Fazenda de Tu- 
canduva in sylvis ad truncos (2000 ped.), Weir, n. 84 ; Sierra do Moretes 
ad arborum truncos (2000 ped.), Weir, n. 111. 
Statura M. reptantis. Folia viridia, caulina haud acuminata. 
ll. M. MaAcRODONTIUM (Hornsch. in Mart. Fl. Bras. Musc. 82, 
Hypnum). Caulis arcuato-declinatus, radicans, pinnatus, ramis erectis 
fasciculato-ramulosis rigidis recurvis. Folia caulina remota, erecto-patentia, 
caviuscula, ramea laxiuscula, planiuscula, pallide viridia, cellulis linearibus 
confertis; perichztialia e basi latissima concava in acumen longissime 
subulatum recurvatum attenuata, enervia, subintegerrima, amcene viridia, 
basi laxius reticulata. Theca in pedunculo unciali erecto flexuoso tortili 
gracili levi purpurascente superne ferrugineo nutans, ovata, obliqua, 
brunnea, exannulata; peristomii dentes exteriores longi, late lanceolato- 
subulati, intus cristati, postice ferruginei, antice hyalini, punctati, interni 
in membrana lutea lanceolato-subulati, solidi, ciliis ternis brevioribus 
hyalinis teneris interjectis.— C. Müll. Syn. ii. 276. 
Hab. Brasilia, in districtu adamantum, prope Villam Ricam et Salgado 
ad fl. S. Francisci, Martius ; prope Tijuca in vicinia Rio Janeiro, Olfers. 
12. M. viscipuLuM (Hampe in Ann. Sc. Nat. ser. 5. v. 319, Hypnum). 
Folia caulina patentia, subcompressa, medio tenus binervata, margine 
superne serrulata, ramea angustiora, magis elliptico-lanceolata, concaviora, 
